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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d851e6614af304588c447156ba93419793a791182a3e391c3f5f44af4c895f5' 
  AND token = 'bYJ236jUDc30fkSW+fjSwMpS06Z7eHbKLdQ6MzXxoeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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