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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df144b61e272c63cfca6330dab914b414006f6d2cc67774d5615e3d563b45eeb' 
  AND token = '0fk1LOibv96of9wlQ+MwUWzYYETfUOW6EU+Cx0ZrLGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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