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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01e71cd576f00c27fb4a6e80513f75970a5f7ab225017bdf3409133a3d1040b9' 
  AND token = '1/9m4i//ZFJQyBDrTcO3ZQNUzHg5TdgDIhhtY9rcOc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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