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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ca680b4e52f3600f5448fc945c969c77c745fec25417aefe7313944ba0bfb1b' 
  AND token = 'nP2pwUz1o2EqlqnNkMnrF7fS78gcx62BmwKqacaFi8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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