SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd649752de8c2fc3162f32a505e431f77724edf529ef99fcfc0439a4ab62c2459' 
  AND token = 'cyJlB4+4q01/SFyAg7CK5pdTB4/7vw803nGs/818Whs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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