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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ae5faf39f1e4aebf0d6aeba6ba914e6d736f893018378198e2791deb4d2542f' 
  AND token = '9C8EcFLVoEmIGZmqtqJHC0bVqCLxcKeSXdP1WQx8il0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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