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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff487a6748ea097683cde84eb1684b87bf041056b97efe42c5387f63cff10d55' 
  AND token = '80ije23dAnWhEg4mc7qtvvDBQTyWv8Hh+aWSlBdXdZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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