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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3bed81813d07e428ed796d363902babb29593a99676a795c970da89dcd9f6e8' 
  AND token = 'IATBUtGX5toOymN04j3Og4AtvTCdhRsZKaLYyXD9rHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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