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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ce55417d328193e3fceefaef14c59175a64aaa553ff799dea889c6b338dada8' 
  AND token = 'yaXL0JSrvD5RkC3Ul5HaCUnTTGRn2QI37ENOUmKbKVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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