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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b996c9de6bd0ed524b58311b0dfc2c90880bcd056e0155c51694b888758ba6b4' 
  AND token = 'yP5FCbr2V4EiZRq0Je0b7TbO8hT/zrrFSUF8wqkOxfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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