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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '560a55e93e197524af42a1586f11e83c7b5de3b8937888cf7ced4a7f329be831' 
  AND token = 'cyWhkXTg9Y4/DcWs6wDhy5FKknNiR87P/5uQhMS8A0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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