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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7865f28f733241e69263fd063c37a63b7f4d0372d2934fabb2e79871adee6f92' 
  AND token = 'uyqU6YEeiCthfqm/9M16ccUEzd0XM8RgmWXtrXbP92s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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