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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19af7d9df5a5cc8010d09e0095a95d2de612f4224eb7d9dcafb674d7ac5c9dde' 
  AND token = '14rupsR9mK+6CppX7cVvVWxcEo87b+iRS0LQqTuyISE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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