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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b90ab5fc0c979daadf126d743997d4defdda995761bfbfd84411bc3f627e8527' 
  AND token = 'v85t9okQ0df4qehH9o7gJzeBmv5yE4kytbnekiqfU4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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