SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0147ad959059ac735fcf4c2fc47cb0f4387c83966866ea15148828e3c2fb64b3' 
  AND token = 'FqUkZjH2bgqtp6EwWGSc37Mva/0oiJqOdgs8fbv4jd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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