SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f076c1f594a43053f73ef339c25b863067d4d77966afe4fdf9fa8f7ea2d4d93' 
  AND token = 'y11HqMbkdu61YLVgT00YQ9hPYwoxVH0LB0BK7jBtW9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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