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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c0c15cc79a017b50f75c7f170398815886e72f9808c919148aceb849506640a' 
  AND token = 'Q35GWP/UUT0FXRusq5rLngMA9UxxsriWkexAN+OsqQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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