SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d78892b66f76d0ac89320eb2b22b064f3c6116a83594af3161ede4d76f23565' 
  AND token = 'GExSg+w+lBuaTBTdmHuZTuvry9Es4Ko5M8CT+ZvwX0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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