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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09474d285ff2946fc6af0cb9af4662211059a89fded721d39ecad5455e79d264' 
  AND token = 'jpcdA9b7RJXyUU88Q0oeAd2AnUL7yEBpcbVfk1JHPHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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