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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '491f942838965de2e7d1573ffc584ee552ee488405095db55de71d896345b7eb' 
  AND token = 'YgwcbofBwSrxlaWkNyAhb0C39U9pTZzirSlSXaqtKs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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