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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc5ef809e520b070f3b8eceae12f1ae558b3a542d584de020cd1129eaee4ee45' 
  AND token = 'LfG0JIyP1Zn8u2E09r9vQkVPGXalokhKZ5CeNj5uoFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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