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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8be096cbed84670145d56e9abe5a1e9e771384379c5901b12491f40a5fe2099f' 
  AND token = '6dKsRwzPUyuK0peV9K3d5+UWFViNyj+UqS9Ln8tQpwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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