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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ad495d25ed5910a0dbb320050f04fc98e19429f6e1a0b37e452edd7847a5afd' 
  AND token = 'RcHDx0KELZpf+iJU/jE6PLD2Z2nSot77rNterxywtTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}