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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1603dec6ca32fa6d5988b9139b8e00b3f1e8cc73bf613845c8eb5f9e33c57ca6' 
  AND token = 'SBmW2jdRyZlRUhqioo3Z0mz3TK3JIMp7508Phh+qh3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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