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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddd392a42bca7c71442cfb200dbc70f7c83372517855c378c47c9b75963b96b5' 
  AND token = 'i7TbNH66jqOq2nJcGfJLUdX79qxZO6ZJw8ESm2hfTKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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