SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc1034341de2e2db231e4a067efda6b40310158a6c373791a29475892b22b9bd' 
  AND token = 'LAkVi2GBaV1ypj9KjPuTBA+PjsfE4lgjVwxNFZlOA1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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