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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b5433ef19289a068c539627284d3a655a44e30a3cd38037f1a6a9e27345000a' 
  AND token = '8ZSOph3Y52zqlfsnnC9MUZQO4E1W9h0rhqx1mrxi8OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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