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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe452fd790715f598f7553450cb00564fed3213aa9d757540d2225056418581a' 
  AND token = 'RUWrZO3Ui3ddDK4Cz9j8g7BDADmh7OZK4W1tvr0mDWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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