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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41e64b4ee29a09610e9696beedd7dca9cb3c1f7d4d5cb58267a819ec50b63cec' 
  AND token = '9yeOgUxZpkgaHPXQ+7CJYyDjC9ezCF2A+OAd3RFQ4bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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