SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13275f593098dcac40b7487c59bcbff4ccaccb66386359413160011ff5d3d45d' 
  AND token = 'hx10MOU3rvPJD4LYn2ZZuJN5azkg5E8vEp4wTwVVCsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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