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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'feee90c411b9bfcb05666360aac25447f4e4bf1d8e0b74c884d5a1fc7233f91a' 
  AND token = 'cru6yDuFryXPsc/53oEweaO5g3wK/Alpf5fQlvt66Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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