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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '312946ed02890c4be689897a98386a6d14a42b01e97cad91e63342acf46d89ae' 
  AND token = 'nyPzgaoD3YxDwbYaBkp1w+YhEEwsuk/YR07G26zMMbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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