SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb40a485160b64a48fe792f206f1354c61f1b87856661be0316eaf3e0641564e' 
  AND token = 'r6hk8m/dGGBfW/KnfbYRUbkV+LqqG74h7IUf2gVdP3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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