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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e982332a6d3d9994b220b7fe20b3af7a89872742d827709447475bc7b22930d' 
  AND token = 'S0onIgeernFKiXD3E/Yc3CGI78cIGt0gPa8swPNDzDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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