SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ff12ec51fb65b10815a9aa92af6349123b42be3d838aeaf73aae6ac9e6819c5' 
  AND token = 'mJG054+QcWangok3VGC/h64WECBzxPYfgSGv08g3Dvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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