SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3574befc8bc61b94a3cdd779fb8c9e57a7b72a32e8505546218d7de0f642a4d' 
  AND token = 'YmWnf0b4qh8sugcp3riIgTxflxZjIQazwKWp7OcZIOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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