SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fd3590678b3cc71d229355ac6d4e5f00aecd0e62843e24e3c9969fc85acbc0d' 
  AND token = 'zsghSSucVOgUImm+lvL1z2or58WCcGJmslg1TsKUZX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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