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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96e1718202fffecc40f5a901af5deaccd0d631749d59e2aee133f76d90b568d9' 
  AND token = 'KQ/2dXrZXIJHf4atHQB7NlRPFAAaQqJY6OM1/f9qWnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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