SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f87dca1b0b076d2ccb1df753f524357ce261caebee4d45895cb20efff4b9d530' 
  AND token = '9kr0v/ZVyXtiyT26uh/25+oK9BlXybGjlLZHSBElBCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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