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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '023ac3ea421e8d9e741ab37980901a255a6b7c6c5242c46dc04c5e4f3ffd7a56' 
  AND token = '2X5j8OHQE9sWOxnsssQrlYPsGge4UCuvYb1WjnvblXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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