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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '991de16d9c550f35be249ad96e61b7bea22b8ed431232df37c24736452d46cde' 
  AND token = 'M9oshOEy0HxvvhJrRqN+WuqLvqgoAyOMqQgu5xHdfpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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