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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf1c58bd4308ef8415b62df4887a582c4512140d1ec9175e63de64fd7f98c6a4' 
  AND token = 'HEsjXXGF960VWkrUX8yB8xthenvReDCOi+XTyshtk7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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