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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0882b7a29b6beca289a649d129951781a267e1b818e61d4a7699d2a04cbf012b' 
  AND token = '515amFj2EwYaiL7dKGrvRj0dPD//pskzQnQbhX5NxTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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