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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28d95aa5b730c303c09b8505513dc162d38b5fe9a3dfd216fa662a243105fc53' 
  AND token = 'cOjHGcRYntVyUXU74Xgc203Iu9j/giF0p5latdFtc6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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