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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d9e9324cb9e96fe929f47c6f28d1cdfccb02b5a2a6e39c866a39689dbaaa6ea' 
  AND token = 'Js0udZT22ypt9qF9J7s28nSFDlKT0kaLumUIgtj/9cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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