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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7209174eaff0168d64df0afb81a6c260b79fd640eb24875c9f617d7e45e4b70b' 
  AND token = 'eyGRxovzK2CahwVlZxoda3bNrXqFZUaxvk6eNGYIELM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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