Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8c74bad8b8aa0ff3b1f409daa4964c4e2e9995a5c12e602fcd50ee4366cf255' 
  AND token = 'FVBX2dTiTf1fgEsn2IjybhfaW8LleAMzeH5/JeZIfnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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