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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '338fb99f1dd816e14c73bc49c015328b5fda44c8bf5be44026e8bc64b90f24bf' 
  AND token = 'wADwBAB2284UISYQ2I2THr+T2RaRQ6g7PCPKbbgfFHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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