SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdb40d4ba3acf0f97f7ef3b393185143d1cf2b31c96b8044c0c2a7755d75f79b' 
  AND token = 'GArNHOgI74x+h5EKKTHd1USZ/IczZWB+Ez35uZ3j8To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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