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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d7482fa58b2577a587d6b937b27d20fe62641dafe177e86722a43d1b28dec6e' 
  AND token = 'QjccxAX0jsyH73YWQGaJ2348x/AGDx0Pdt1xLTVFUgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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