SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '082be12bf179419faa1f9507ad742836d6824b0591b3aacba7e18ee8b716aac3' 
  AND token = '/AFPSDnXo+/3Lj8mBDfEL2j2MsQTv1eCORg0n3u+ZGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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