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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '587b1b8ea4358f9602d2c6a76efd3464f912ba818acde849da82f1c0edfb518a' 
  AND token = 'lntFNnK8Qjc8QnDRYGG9On843mw0iqvVzQGcAYENxVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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