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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7605b76e26f1da37a96e43fc37c2ba6b34875cee5a6fc7c281330292c22bd6e' 
  AND token = 'wZ+nVZ2kQWDQ+mP7pEaYA+BmB57sDaJD8V77k6MnST8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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