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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13927a74cc5a68e44cd07f898be9b7b192b2e70ed642e36f6d2d0f2f1bd1486b' 
  AND token = 'izWl/F/fi7/8CIqAM/73o+tUXoINpBRqP3/RyRgt9dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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