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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccfa8b65372ac1fbf1214eedb54e396855f2565439afa078a3d4e6191affb89b' 
  AND token = 's3a5EFFJjDkDy94fJ4ZTXLzJZnENW7jIzwLMJXdZIx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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