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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca084f7d6c26bc51304539a777006fdf5ab643bd53a37fd0fdecb5c1dfcc749e' 
  AND token = 'tH4bVUr2bdE7CWbMb8kc4KT3nmU5VI32/pD7Yj5tP4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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