SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec3f013947f274c9b50e44603a76639c9b99b6ee9626bdf6c7a45809b4013a5f' 
  AND token = 'rnpFAj87BvD0d4rGKxCmIni7JvUKH3IOAUA29R8HJVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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